TY - JOUR

T1 - Visualization and topography of the stray magnetic field of crack-type discontinuities in magnetic materials

AU - Ivanov, V.

AU - Bashkinova, V. N.

PY - 2006

Y1 - 2006

N2 - Configurations of the domain structure of gadolinium-cobalt amorphous films placed in spatially nonuniform magnetic fields, which are produced by cracks in steel plates, are determined. The possibility of visualization and topography of the stray fields (their normal H z component) of cracks with openings 1.5 to 50 µm wide by the use of an applied magnetic field is shown. Strip domains, which determine the coordinates of edges of cracks with an opening width d > 20 µm (or peaks in the coordinate dependences), are formed near the saturation state under the action of the field. This result is in agreement with calculated theoretical topograms. An unusual discrepancy in the positions of peaks in experimental and theoretical topograms is observed for narrow cracks (d < 10 µm). It is likely that the observed discrepancy in the position of peaks in topograms of narrow cracks is related to the interaction of crack edges during their convergence, i.e., their partial mutual magnetization reversal.

AB - Configurations of the domain structure of gadolinium-cobalt amorphous films placed in spatially nonuniform magnetic fields, which are produced by cracks in steel plates, are determined. The possibility of visualization and topography of the stray fields (their normal H z component) of cracks with openings 1.5 to 50 µm wide by the use of an applied magnetic field is shown. Strip domains, which determine the coordinates of edges of cracks with an opening width d > 20 µm (or peaks in the coordinate dependences), are formed near the saturation state under the action of the field. This result is in agreement with calculated theoretical topograms. An unusual discrepancy in the positions of peaks in experimental and theoretical topograms is observed for narrow cracks (d < 10 µm). It is likely that the observed discrepancy in the position of peaks in topograms of narrow cracks is related to the interaction of crack edges during their convergence, i.e., their partial mutual magnetization reversal.

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UR - http://www.scopus.com/inward/record.url?partnerID=8YFLogxK&scp=33646405209

U2 - 10.1134/S1061830906010025

DO - 10.1134/S1061830906010025

M3 - Article

VL - 42

SP - 12

EP - 18

JO - Russian Journal of Nondestructive Testing

JF - Russian Journal of Nondestructive Testing

SN - 1061-8309

IS - 1

ER -